Coherent and incoherent Upsilon production in ultraperipheral collisions at the Large Hadron Collider

Abstract

The exclusive photoproduction of ${\rm Y}(nS)$ states were calculated in ultra-peripheral collisions for coherent and incoherent process in PbPb at $\sqrt{s_{NN}}$= 5.5 TeV. Different dipole models were compared in the theoretical framework of light-cone color dipole formalism. Moreover, it was calculated the differential cross section for the Upsilon states and their total cross section for two intervals of rapidity: $|y|\le 4$ 4 and $2\le$ y $\le 4.5$. A systematic study is done on the theoretical uncertainties associated to the production and predictions are presented for the first time for the incoherent cross section of the radially excited states.

6 pages, 3 figures, 2 tables. Version to be published in Physical Review D

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